My cockatiel wont eat, PLEASE HELP!?

I own thirteen breeding pairs of Tiels and have found that the males are not always the agressor in fights it sounds like your Shelly and Magoo had a falling out. First never take out the male you need to put him back as soon as possible. Start by taking out the hen a pair of gloves helps let her bite on the tip of a finger,and pull her out of the cage then put him in he should go in the box and sit on the eggs. Let her settle down you will be surprised at the mess she will make you really need to get her out before much longer because she will not mess in her box and can become very ill from holding all that waste inside her once she has evacuated give her a flat water bowl to splash in and some plain millet or corn chex, have never had a hen turn those down, and her attitude should mellow out. Then you put her back in the cage. She really should be spending her days out of the box. males sit the eggs in the daytime and females go in at night as a general rule but as with all couples every pair of Tiels has a different method I do have a pair that I often have to pull the hen out and yes he feeds her so she will stay on the eggs so he won't have to. Every morning I pull her out and put her on a perch over a newspaper to dump. Good luck with your pair